This site creates a backchannel or chat room. It was very quick and easy to set up. I had Wes log in and make comments with me. It was easy for him to get on. No setup necessary. Nothing to download. He could see uses for it with his classes. During a presentation, students could ask questions or the teacher could give a question for discussion and students could add comments and see other classmates comments. You couldn't ask for anything easier to use. I hope it's open for students.